Sprocket wheel



-May 31,1927. 1,630,313 C. RORABECKv sPRocKET WHEEL- Y Filed Aprii 30 1925 2 Sheets-sheer 1 *May 31,1927. l

' C, RORABECK SPROCKET WHEEL [Filed April 30. 1925 v 2 Sheets-$heet 2 i 25 ments each of lwhich' 40 body of the wheel, t

Patented May 31, 1927.

i' UNITED j STATES PATENT oFFicE.

CLAUDE nOE'AEECx, n GANESE STEEL COMPANY,

AMERICAN MAN- SrnOCKET WHEEL.

Appucation 'med April 3o, 1925'. seria1 No. 26,855.

This invention .relates to lwheels having teeth or other specially designed contour adapting them to enter into driving relation With a chain by engagement therewith as 5 distinguished from mere frictional contact; for instance a sprocket wheel, the perimeter of which is in theform of a regular polygon rather than c lindricah and the invention linds its fullest realization in a sprocket wheel having not only polygonal periphery but also projecting teeth as .the means tor lestablishing driving engagement with chain. l i Y f In sprockets of' this kind, particularly l5 when used in situationsy where the. engaging Surfaces are subjected toexcessive wear, it is desirable to have the outerl peripheral surface of the sprocket 'wheel replaceable, as well as the teeth, in order to prolong the life. of the. article; and, accordingly, one object of the' present invention is to provide an Iimproved construction of replaceable rim on a sprocketwheel, and to form such rim of a plurality of separately 'formed segis adapted to be mounted upon the-sprocket wheel through means of fitting faces that against displacement in'directions of drive, as well as radially -to the wheel and will admit of assembly only in directionsat a sub- Stantial angle to the plane of the wheel, for instance, in the direction ofthe wheels axis. To this end` each rim Segment is -formed to {it'anexternal angle of the polygon and to constitute a portion of eachof the bearing faces which meetl at theangle; the ends 'of said segment being provided'with interlockl ing lugsextendingnwardly toward the center ot the wheel and entering recesses in the ereby `adapting the segment to grip' the wheelfa dresistfdisplacement of .the segment, ularly in the direction radial to the wheelfj Inasmuch'as vthere are' two of the's'e anchoring or gripping lugs,`" and `they are Vpresented at sub-v stantially -less than a right -angleto thev 'chord of the segment, theyare adapted to, resist radial displacement ofthe segment as-v well as dis lacement in thedirection of tho drive, so t at the segment is movable 'relai tively to sembly only in a direction parallel to he axis ofthe wheel. l

Another Object of ,the inve vide a replaceable tooth Oni is'to'proleelf the the will interlock the parts.

whichljof this body portion ,outline of a hexagon,

at aside of thepolygonadjacentthe make the A periphery. :of the wheel 1 replaceablewhen worn, it has a sepkind described, which. for the sake of rendering it reversible 1n positlon, notwithstanding it may assume an unsymn'letrical relation to the two sides of the replaceable segment, is made separate and ap'arttiomthe segment. and assembled with the. wheel oy introducing it into a socket of the body of the wheel and there securing it by means of a pin, bolt. or the like.`

Still another object. ofl the invention is to utilizetlie separately formed and removably inserted sprocket tooth as a means for prevent-ing movement ot the rim segment on the body of the wheel in the direction ot disassemblyr and, to this end, another vfeature of the invention consists in extending theI tooth-receiving socket through the rim segment so that when been assembled by a sliding movement parallel with the axis of a movementtransverse movement of the segment been secured against removal, the parts will be releasable for replacement by merely takshown in the accompanying drawings, in

Figures l an( 2 are two elevational views, as seen in directions at right angles to each other, Showing one torm of the invention- Figure 3 is a section on the line SX--x of Figure 1 Figure 4 is a ,fragmentary view showing a modified form of anchoring lugs through means of which vthe segments grip the body;

-Figure 5 is a Similar view snowing still another vform of interengagemcnt between the segments and the body of the wheel.

1 represents the body ol" a sprocket wheel adapted to be'mounted upon asliaft through whichit is. to bedriven. The periphery 2` follows in general the from which project driving teeth 3 at regular intervals, fornstance, by'having each tooth 3' positioned Iwith its 'longitudinal axis perpendicular to angle/L In order to arable rim made up of a plurality of segthe wheel, and the' toothv hasfbeen introduced int-o its Socket by to the assembling and said tooth has the rim segment has los - so. as to present each tooth norinal to a face radial plane of the wheel,

' consti-tute the meansfor ments 5, each of which comprises in its forni portions 6 and 7 `of the faces' of the polygon of the wheel, and each of which is anchored to the wheel by means'of lugs 8 at its respective ends which enter recesses 9 in the body of the wheel.v lnasii'iuch as the lugs 8 are inclined inwardly from the medial radius ot' the segiiient 5, it is obvious that said segment cannot be lifted from vthe body of the wheel by a radial inoveiiient, nor would it be possible to displace the segment from the body by sis-'inging it lupon one of itslugs8` since the path of movement of the inner corner of its other lug Would intersect the radial cess 9. Hence, means resisting outward displacement ot the segmentsl as well-as anchoring means which resist displacenient inthe direction of drive, Y a segment with the wheel is limited to movement substantially parallel with the axis of the wheel.

The teeth 3 are mounted on the wheel by introducing them into sockets 10. which could, of course, be made with their axes coincident with radii ot the wheel extending throng i. the corners. of the polygon in ac'- cordance with .known forms of drive sprockets, but they are preferably -formed of. the polygon near one end of the face or the angle at which itineets an adjoining face; and in order that the tooth 3 may resisting disassembly of the segment 6 from the wheel, the socket is continued through the segment, as shown at 1()a in Figure 3. As also shown in Figure 3 lthe inner endof the tooth 3 has its sides inclined to the circumferential so Jtliat it basa wedging seating inthe socket laterally as Well as in the circumferential direction, as shown in Figure l. Thefteetli are secured' in their sockets by any suitable form of pin, for instance, the bolts 11.

'As shown in Figure 4, the segments 5 may have their anchoring lugs 8a; formed lwith half dovetails or inward enlargements conforming'to-dovetailedrecesses 9a in the body la'of the wheel, so crease their grip. upon thebodyof the Wheel. lOr,'as shown 1n Figure 5,'segnients 5 may have anchoring and g'ripping'lgs spec-t to the medial radial wall of the re the lugs 8 are interlocking two adjacent sides and assembly and disassembly of vlugs on a segment cent sides of. tli-e 'interlocking against .holding them 8b engaging the undercut sides of rim lugs 65" ot' two adjacent sides of lthe polygon and tri the angle between them; said segments havinglugs engaging recesses in the Wheel;

the lugs. on a segment converging with rement and interlocking the szgiiient against radial disi'ilaeeinent from thewheel.

f2. A sprocket wheel,

a separately -tormedrim composed of segments, each of `which .conforms to portions of the polygon. and to formed. rim composed of segments, each of' which conforms to. portions plane of the segcomprising a body `portion having a polygonal periphery `and 'the angle between them; said' segments having lugs engaging recesies in the Wheel.; the to the medial radial plane of the segment and interlocking the segment against radial di.-=pla .eii'ient from inwardly to increase such interlock.

3. A sprocket wheel, lygoual body portion` separately yformed rim segments each conforming to two adjacent sides. of the polygon o`f the body poi'- tion.` sliding into assembly with the body portion in 4the direction of Aits axis .and interlocking against displacement thereon eithei' eirciimferentially or radially, and ren'iovable teeth tion and intersecting the rim segments and .holding them lagainst disassembly.

4. A sprocket wheel, consisting ot' a polygonal body portion. separately formed riin segments each conforming to two adjapolygon of the body portion. sliding into assembly with the body port-ion inthe direction ofV its axis and displacementthereon consisting of a pothe wheel, and enlarging socketed in the` body porconverging with respect eithe` circuii'iferentially or radially, and

removable teeth socketed in' the body portion and intersecting the rim segments and against disassembly: each tooth being located with its longitudinal axisnormal *to one`face of` the polygon of the polygon.

Signed at Chicago Heights, Illinois, this 23rd day. of April, 1925.

CLAUDE 'iionannoie loo 

